AoC Day 21, Part 1 Solved
This commit is contained in:
🐙PiperYxzzy
100
2023/21/README.md
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100
2023/21/README.md
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## \-\-\- Day 21: Step Counter ---
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You manage to catch the [airship](7) right as it's dropping someone else off on their all-expenses-paid trip to Desert Island! It even helpfully drops you off near the [gardener](5) and his massive farm.
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"You got the sand flowing again! Great work! Now we just need to wait until we have enough sand to filter the water for Snow Island and we'll have snow again in no time."
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While you wait, one of the Elves that works with the gardener heard how good you are at solving problems and would like your help. He needs to get his [steps](https://en.wikipedia.org/wiki/Pedometer) in for the day, and so he'd like to know _which garden plots he can reach with exactly his remaining `64` steps_.
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He gives you an up-to-date map (your puzzle input) of his starting position ( `S`), garden plots ( `.`), and rocks ( `#`). For example:
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```
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...........
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.....###.#.
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.###.##..#.
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..#.#...#..
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....#.#....
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.##..S####.
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.##..#...#.
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.......##..
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.##.#.####.
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.##..##.##.
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...........
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```
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The Elf starts at the starting position ( `S`) which also counts as a garden plot. Then, he can take one step north, south, east, or west, but only onto tiles that are garden plots. This would allow him to reach any of the tiles marked `O`:
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```
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...........
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.....###.#.
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.###.##..#.
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..#.#...#..
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....#O#....
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.##.OS####.
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.##..#...#.
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.......##..
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.##.#.####.
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.##..##.##.
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...........
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```
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Then, he takes a second step. Since at this point he could be at _either_ tile marked `O`, his second step would allow him to reach any garden plot that is one step north, south, east, or west of _any_ tile that he could have reached after the first step:
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```
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...........
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.....###.#.
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.###.##..#.
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..#.#O..#..
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....#.#....
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.##O.O####.
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.##.O#...#.
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.......##..
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.##.#.####.
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.##..##.##.
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...........
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```
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After two steps, he could be at any of the tiles marked `O` above, including the starting position (either by going north-then-south or by going west-then-east).
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A single third step leads to even more possibilities:
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```
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...........
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.....###.#.
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.###.##..#.
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..#.#.O.#..
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...O#O#....
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.##.OS####.
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.##O.#...#.
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....O..##..
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.##.#.####.
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.##..##.##.
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...........
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```
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He will continue like this until his steps for the day have been exhausted. After a total of `6` steps, he could reach any of the garden plots marked `O`:
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```
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...........
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.....###.#.
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.###.##.O#.
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.O#O#O.O#..
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O.O.#.#.O..
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.##O.O####.
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.##.O#O..#.
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.O.O.O.##..
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.##.#.####.
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.##O.##.##.
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...........
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```
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In this example, if the Elf's goal was to get exactly `6` more steps today, he could use them to reach any of `16` garden plots.
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However, the Elf _actually needs to get `64` steps today_, and the map he's handed you is much larger than the example map.
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Starting from the garden plot marked `S` on your map, _how many garden plots could the Elf reach in exactly `64` steps?_
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89
2023/21/code.go
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89
2023/21/code.go
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package main
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import (
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"fmt"
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"strings"
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"github.com/jpillora/puzzler/harness/aoc"
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)
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func main() {
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aoc.Harness(run)
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}
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// on code change, run will be executed 4 times:
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// 1. with: false (part1), and example input
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// 2. with: true (part2), and example input
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// 3. with: false (part1), and user input
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// 4. with: true (part2), and user input
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// the return value of each run is printed to stdout
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func run(part2 bool, input string) any {
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grid := make([][]rune, 0)
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v, h := 0, 0
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for y, l := range strings.Split(input, "\n") {
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if l == "" {
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continue
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}
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gridLine := make([]rune, 0)
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for x, s := range strings.Split(l, "") {
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if s == "S" {
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v, h = y, x
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}
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gridLine = append(gridLine, rune(s[0]))
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}
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grid = append(grid, gridLine)
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}
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steps := 64
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// when you're ready to do part 2, remove this "not implemented" block
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if part2 {
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return "not implemented"
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}
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// solve part 1 here
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possibleCells := [][]int{{v, h}}
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for i := 0; i < steps; i++ {
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nextStepCells := make([][]int, 0)
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alreadyStepped := make(map[string]bool)
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for _, pc := range possibleCells {
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if pc[0] > 0 && grid[pc[0]-1][pc[1]] != '#' {
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if _, ok := alreadyStepped[fmt.Sprintf("%v;%v", pc[0]-1, pc[1])]; !ok {
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nextStepCells = append(nextStepCells, []int{pc[0] - 1, pc[1]})
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alreadyStepped[fmt.Sprintf("%v;%v", pc[0]-1, pc[1])] = true
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}
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}
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if pc[1] > 0 && grid[pc[0]][pc[1]-1] != '#' {
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if _, ok := alreadyStepped[fmt.Sprintf("%v;%v", pc[0], pc[1]-1)]; !ok {
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nextStepCells = append(nextStepCells, []int{pc[0], pc[1] - 1})
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alreadyStepped[fmt.Sprintf("%v;%v", pc[0], pc[1]-1)] = true
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}
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}
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if pc[0] < len(grid)-1 && grid[pc[0]+1][pc[1]] != '#' {
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if _, ok := alreadyStepped[fmt.Sprintf("%v;%v", pc[0]+1, pc[1])]; !ok {
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nextStepCells = append(nextStepCells, []int{pc[0] + 1, pc[1]})
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alreadyStepped[fmt.Sprintf("%v;%v", pc[0]+1, pc[1])] = true
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}
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}
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if pc[1] < len(grid[0])-1 && grid[pc[0]][pc[1]+1] != '#' {
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if _, ok := alreadyStepped[fmt.Sprintf("%v;%v", pc[0], pc[1]+1)]; !ok {
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nextStepCells = append(nextStepCells, []int{pc[0], pc[1] + 1})
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alreadyStepped[fmt.Sprintf("%v;%v", pc[0], pc[1]+1)] = true
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}
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}
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}
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possibleCells = nextStepCells
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//fmt.Printf("Possible steps: %v\n", possibleCells)
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}
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return len(possibleCells)
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}
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11
2023/21/input-example.txt
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2023/21/input-example.txt
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...........
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.....###.#.
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.###.##..#.
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..#.#...#..
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....#.#....
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.##..S####.
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.##..#...#.
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.......##..
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.##.#.####.
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.##..##.##.
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...........
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131
2023/21/input-user.txt
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2023/21/input-user.txt
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...................................................................................................................................
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..#.......#.#.##...........#...#..................#......................#.......#.......#............#...............#.....#...#..
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................#....#.#.....#.#..#.#..#.........#.....................#......................#......#....#..........#.............
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..#.##.....................#......##..#...##.#............................#.....#..............#..................#..#......#......
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.....#.#.....#...#........#............#.#.#..#.#...#.........................................##......#..........#.#..##...........
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.....#....##.........#.......##............##....#.............................#.........#.....#....#.#....#...........#.##........
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...........#..#...#...........#.....##................#.........#..#...................#.#..#.....#................................
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..#.....#....#....#....#......#.#.............................................###.#.......#....#..........#.#....#.....#...........
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....#........................#............#.......#...............#..#.......#..........#.........#....#......#..##.........#......
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..........#...#..........#..#............##.........#...........#...............................#.........#........#........#......
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....#............#.#...........#.............#..#..............................##.#....#...#.#.#.#.#........#......#..#............
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....#..#...#.#....#.#.##..#...................##..#........#.##....................#............#......#........#...#..............
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......#.....#...##...#...#......##.....#.....#.#...............#....................#.#......#.............#..........#.........#..
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......#....#..#...........##...#.#.#.#.#......##...........#.......#.....##.............#.#..##...##....................#.......#..
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......................................#.#......#.......#....#...#.#..#...#............#..#........####......#....##................
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..#........#........#.............#....................#.......#....#.....#................#...................#..........#........
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..................#.....#.#.#....#......#.....................#............#...............#..#......#...#..##......#............#.
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...#........#....#......#............................#.......#....#........#.#............................#..#....#......##........
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..#..........#...#..................#......................#......#........#.............#....#..##.#......##......##.#............
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...........#..........#......#..#...#.#...........#.......#.....#.....#..#...............#..............#...#.....#.##.......#.....
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.#......#..#....#..................................................#..#......#.........................#.......#.....#.....#.....#.
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.....##..................#............................#...#........#..#....#.#..............#.....................##.......#..##...
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.........#...#......#.....###..........#...............#.......#..................................#.........##....#.......#........
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....#........#.................#..............#.#......#...##...#....#...#.....#...................#....#...#.....#....#.#.........
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.....#....##....#.............#...#..........................#..................#.................#..........#..............##...#.
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....#.#..#....#.................#............................#......#.#................................#..##......##.....#.........
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......#.................#........#.........#......##....#...#.#........#...#.....#.....................##........#..#..#...........
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..........#.#.......#......#.....#..................##.......#........#.....##....#.............#.................#.#..#...........
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.#.#....##.#.#.......#...................##....#...#..........#.........#.#..##.#.......#........#....#....#.#..........##....#....
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...............#......#...#..............###......#.............#....#...##........#.................#....#.................##.#...
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.......#....#.......#.....##.#................#...........#....................#.....##...##.........#....................##....#..
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.................#.....#........................#........#.....#........#...#......#................#............................#.
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..........#.................#........#..#.....................#...........##.#..............#..................#.................#.
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.#.#.#................................#...#.#...#.........#...#.....#...........#..........#.#........#.#.#..........#.....#.......
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.#..#...#..#...............#.................#...##...#........#........#....####......#....#.............#..#...#.............#.#.
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............##........#...............#.#......................#...#..#...##..##..........#...#.........#..........##.......#......
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.........#.#.#...#......#.....................##...............#..#.###........#............#..#......................#......##....
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.#........##.......#.............#.#..........#..#........#..#.#.................................#..................#......#.#.....
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..##...#....#..........................#...#.#.#.........#..#............#.......#....#..............................#....#........
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......#.....##....#...................#...................#........#...#....#...........#..#.....#.................#.#..#.......##.
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....##...#......................#.##..#....#...#.....#..................#..#...........#.....#................#...##...........##..
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...............##...............#.................#.......##..........................#...#.#.........#........#........#......#...
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.##....#....#...#...........#.....##....#..............#...#.........#...#.....##.....#........##.#.#...................#.......#..
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.#............................#.....#...#....#.#.....#.....#.###.............#...............................................#..#..
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..........#..................#...#......#...............#.#.......#............#..........#....#.................#....#.......#....
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.#..#....#...#....................#......#........#.......#...#.#........#.#..........#.............#..##...........#..#...........
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....#......#..................#.......#.......###..#.#.#...........#.#............#................#.....#...........##..#.##..#...
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.......#.#.#...................#.##...........#.........#...#............#.....##....#..........#.....#.#.............#.#...#......
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............#........##....#...........#.............................#.#.#....#..#......#.................#..........#......#.#....
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.....##.#.........................#.#...##.#..#....#..........#..........#............#.......#..##.....##.##..............#.......
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..#..#......................................#.......#.#..#.#.........#.....#...............#.....................................#.
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......#........................#.......#.#............................#..#..#.......#......#.....#............#.#................#.
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...###.#.........#..##......#............#.............###......#....#....##...................##...#..#.#....#.............#.#.#..
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..##....#...........#.............#..#..#.#..........#..............#...#........#..##..#.........................#.......#........
|
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.#.....#.............##.....#.....###.#.#..#.......#......#..#........#..............#.#....#.....................#...........#....
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....#.........................#....##......#..#......#.#.....#.#.....#.................#.................#.........#...............
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.#............#.........#........#.#.#.....#.....#...#.....#......#......#...............#.#.........#.............................
|
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................##...#...#......#....#....#.........##.............#.......#.....#.......................#..###..#...##............
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...........#.#..............#..#.......#....#.#.....#..............................#..##....................#.#......#.............
|
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..................#....................#............................##.#..#.#..........#..................#............#...........
|
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.............#.....#.......##...#..#........#.................##......#......#.#..............#..........#........#.#.#............
|
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...........................#....##...#.###...........#.#..........#.............#.....#.#....#.....#....#..........#...............
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.............#........##........#.#.#..##....#......#.............#.#....#.#.#...#...#....#.#..#.......#...........##..#...........
|
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......#..#.....#........##.....#......#......#.#....#.#..#...#.........#.........#..............#..........###.....................
|
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.............#..........#..#...####..........#......#..#....#.........#..##............##.....#..#.....##.#......#.#....#..#.#.....
|
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.................................................................S.................................................................
|
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.....................#.....#.#........##......#......##..#..#.......#.##..#...........................#..#.........................
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......................#.#..........##....................#.................#......#..#.....................##.....#.......#........
|
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................#..........#...#.....................#....#..........#.##.....##........#......#........##....#..........##........
|
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.........##...#.#..#.....#.#...#.#................#.........#.......#..##..#.....#...#...##....#...#............#....##............
|
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...........................#..#..#...#..#...##..................................................##.........##.#...#................
|
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............#..#.........#........#.......#......#...#......##.##.................#.#........##.#....#....#.#...#....#.............
|
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...........#..#.....#..#..#......#.#..#............#............#.........#..#.....#..#........#..............##.......#.......##..
|
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...................#....##...........#.#......#.......##..#..#.#.....#...#...#.##..............#.##....#....#.#.....#.........#....
|
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..................#..#....#......#.#...........#...#.......#........#...#......#...........#.....................#.#.............#.
|
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................#...........#.............#.#.....#.........................##.#....#..#..........#.#...#....#................##.#.
|
||||
......##........#.#......#..........#..........#..........................#...#..........###.#..............................##.....
|
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.....#..............#........#.....#.#..#....#........##........#..#......#......#......#..#......#......##...................#....
|
||||
.#................#.....#...........#.#.........#.#.....#.##.............#...........#.#.#....##.#..........#...............#.#..#.
|
||||
..#..#.............#...............#....#..........#..#.....#...#...............##.....#...#............#.#...................#....
|
||||
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|
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...#..................##..........#..........#...#.................#.......#.....#...#...................#..................#.#....
|
||||
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|
||||
....#.........#............#..#.....#.#.....#.#..#.....#................#..........#.....##...........................##...........
|
||||
.#............................#...............#...#.#.........#.....#...#..........#...#.......##..#..................##.##....#...
|
||||
.......#..................#.#.............#.......#....#............................#...................#.#........................
|
||||
.........#........................####......#......##...##............#.....#...#...##.......#.....#.............#.##.#............
|
||||
..#..#.##......#..........#..............#............#...................##...................#..#.....#.......#.....#...#...##...
|
||||
....#..#...........................#.........#...#.........#.#.....#.............#.......#............#.................###.#....#.
|
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...#.......#.#.......................##....#.......................#............#......#.....#..#....#..........#.......#..........
|
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.......#.........##.#................#.........#.#..#.........#.....#.#...............#.#....#....#............#.....#.............
|
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..................#.#.......................#................##......#...............#......................#..#.#.#..........##...
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......##.......#.......#............#.....#........#.....##....#.....#.............#.#....#.....#.............#......#.............
|
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...#.........#.....#...............#.........#.....#..........#...#.........#....#.#.......###..#.#..............#.................
|
||||
.........#....##.#...#............#.....................#...........##......#..#..##......#.................#..#.##................
|
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.........#.........#...##..............#.#...#..###........#.#......#...#..#............#.......#.............#.....#.......#....#.
|
||||
.....................#...#..........#.#............#...#.#.##..##..........#..#........#.......#........#.......#..#.....#.#.....#.
|
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....#..........#....................#...............................#.##.##.......###.........#........#....#.................####.
|
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..........#...#.............##..................#..#....#............#...................#..#.............#.......#...#.......#....
|
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.#....#..##......#.#.##.....#.............................##.#............#.#..............#.........#.................#......#....
|
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..#.........#.....#........#................#...#...................#..............#..#............#...#...#...................#...
|
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....#..#..#..#...........#................#......#...#......#.....#........#...#...##.#..............#........#.#......#..#..#.#...
|
||||
......##..#..#..............##...........#.#...#............#...#.#.....#.#.....#.......##...............#.#.......................
|
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.......#.........#.........#..............#...#......................#....#....#........#.......#.........#......#.................
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...#..#.........#...#...#........#...............#............#....###.#.#.........#...............#................#.......#....#.
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Reference in New Issue
Block a user